The disentanglement evolution of bipartite spin-1/2 system coupled to a common surrounding XY chain in transverse fields at nonzero temperature is studied in this letter. The dynamical process of the entanglement is n...The disentanglement evolution of bipartite spin-1/2 system coupled to a common surrounding XY chain in transverse fields at nonzero temperature is studied in this letter. The dynamical process of the entanglement is numerically and analytically investigated. We find that thermal effects can enhance disentanglement if the entangled initial state of the central spins does not in the decoherence free space. The critical phenomenon of quantum phase transitions reflected in the disentanglement can be washed out by the thermal effect eventually.展开更多
This study develops geospatial analysis of terrestrial carbon exchange for the conterminous United State and estimates large-scale NEP （net ecosystem production） dynamic from 2008 to 2013. We apply land-use and land...This study develops geospatial analysis of terrestrial carbon exchange for the conterminous United State and estimates large-scale NEP （net ecosystem production） dynamic from 2008 to 2013. We apply land-use and land-cover data in order to coherently include cropland, forest, wetland and other ecologically active landscapes in the mapping. Our results show a distribution of high harvest carbon release in the Corn Belt states, in addition to hot spots around the US in areas like Southern California and Arizona. Harvest carbon is low in areas in the southern United States, and central/southern Appalachian Mountains. We identify NEP changes for coupled agricultural, forest and other high-carbon-uptake ecosystems systems, conversions to and from crop, and land in frequent conversion among forest, wetland, pasture and rangeland. Findings from this study will provide important information to support and promote the co-production of science and decision-making.展开更多
Our studies about safety in society lead us to the most popular book by Karl Mannheim： Ideology and Utopia. This work envisages the discrepancies between social knowledge and the material world itself. The crucial co...Our studies about safety in society lead us to the most popular book by Karl Mannheim： Ideology and Utopia. This work envisages the discrepancies between social knowledge and the material world itself. The crucial conclusion reads as follows： Our image of reality is mostly based on our interests and desires and does not rely on thorough research. There are two types of such representations： utopia and ideology. The first of them, less interesting for us, is the type of ideas which can revolutionize a social being. The second one is a particular set of visions which can never be realized but on the other hand they act as common knowledge （general knowledge of the world）--stabilizing the social structure by presenting it with a holistic image of the world. Taking the above into consideration, how is it possible that representations, being so distant from reality （creating a completely separate ＂world＂）, basically enable efficient functioning in it？ Ideology, being the foundation of the society＇s functioning space, should always be tautological, in the sense that for the participants of the given world＇s image （creation as it is）, it should define the being in a comprehensive and adequate way （in Thomas Aquinas spirit）. What is more, it would always be true. We should also mention that the main tools of ideology, understood this way, are specific definitions and the extrapolation of sense. The purpose of this lecture is to prove that it is possible for ideology to come to life, only when the individuals who acknowledge it will consider their image of reality proper. The above ideological system should be understood as the obviousness of description of the surrounding world which in return makes unreflective functioning in reality possible. This obviousness of the presented world will be referred to as social safety.展开更多
基金supported by National Natural Science Foundation of China under Grant Nos.60578014 and 10775023
文摘The disentanglement evolution of bipartite spin-1/2 system coupled to a common surrounding XY chain in transverse fields at nonzero temperature is studied in this letter. The dynamical process of the entanglement is numerically and analytically investigated. We find that thermal effects can enhance disentanglement if the entangled initial state of the central spins does not in the decoherence free space. The critical phenomenon of quantum phase transitions reflected in the disentanglement can be washed out by the thermal effect eventually.
文摘This study develops geospatial analysis of terrestrial carbon exchange for the conterminous United State and estimates large-scale NEP （net ecosystem production） dynamic from 2008 to 2013. We apply land-use and land-cover data in order to coherently include cropland, forest, wetland and other ecologically active landscapes in the mapping. Our results show a distribution of high harvest carbon release in the Corn Belt states, in addition to hot spots around the US in areas like Southern California and Arizona. Harvest carbon is low in areas in the southern United States, and central/southern Appalachian Mountains. We identify NEP changes for coupled agricultural, forest and other high-carbon-uptake ecosystems systems, conversions to and from crop, and land in frequent conversion among forest, wetland, pasture and rangeland. Findings from this study will provide important information to support and promote the co-production of science and decision-making.
文摘Our studies about safety in society lead us to the most popular book by Karl Mannheim： Ideology and Utopia. This work envisages the discrepancies between social knowledge and the material world itself. The crucial conclusion reads as follows： Our image of reality is mostly based on our interests and desires and does not rely on thorough research. There are two types of such representations： utopia and ideology. The first of them, less interesting for us, is the type of ideas which can revolutionize a social being. The second one is a particular set of visions which can never be realized but on the other hand they act as common knowledge （general knowledge of the world）--stabilizing the social structure by presenting it with a holistic image of the world. Taking the above into consideration, how is it possible that representations, being so distant from reality （creating a completely separate ＂world＂）, basically enable efficient functioning in it？ Ideology, being the foundation of the society＇s functioning space, should always be tautological, in the sense that for the participants of the given world＇s image （creation as it is）, it should define the being in a comprehensive and adequate way （in Thomas Aquinas spirit）. What is more, it would always be true. We should also mention that the main tools of ideology, understood this way, are specific definitions and the extrapolation of sense. The purpose of this lecture is to prove that it is possible for ideology to come to life, only when the individuals who acknowledge it will consider their image of reality proper. The above ideological system should be understood as the obviousness of description of the surrounding world which in return makes unreflective functioning in reality possible. This obviousness of the presented world will be referred to as social safety.
